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  3. aerials can be deformed pl he resultingaequite diftterent from those...

Question: aerials can be deformed pl he resultingaequite diftterent from those...

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aerials can be deformed pl he resultingaequite diftterent from those obtained by plastically by the appicaion of heat, as in forging mechanical properties are given to the necessity of disassermbing the components be for puilers to access The use of shaft shoulders sonhoulam consideration of issues such as accessibility of retaining rat of shat This requires s bearings, openigs in the housing to allow pressing the taining rings, or of a mechanical element s a built-in property of a material, or rs s a bad means of axalily locating the shaft elements bad means thrust loads complete diagioatn ates between unequal magnitudes of tension and compression s usually obtained by completely reversed stress cycl stress level ong shafts carrying several load extremeyvide more than two bearing supports. I ment of the bearings components, it may be In this case, particular care must t the specimea on a permanent set when the load is removed. This point is called the s said to be plastic and the en used in the laboratory to determine endurance limits is ly and tested under closely controlled conditions. It is unrealistic to d urance limit of a mechanicail or structural member to match the values fracture limit The rotating shat specimorn expect the enh laboratory Some difterences include material, manufacturing used for diameters over than 75 mm. The nominal diameter can be left unmachineds thting of components. Hot N 10 cycles is generally classified as low cycle fatigue, whereas high- Cold drawn steel is usually diameters of the bar be rolled steel should be machined all over 30. I snot ecommended to have only one bearing to carry thear all ad in orderto allow 31. nds due to temperature changes In general, it is best to support tolerances on shaft length diensions, and to prevent binding the shaft load-carrying components between bearings rather than eantilevered outboard of the bearings. Pulleys and sprockets often need to be mounted outboard for ease of installation of the belit or chain. The length of the cantilever should be kept short to minimize the deflection For steel and iron, the S-N diagram becomes horizontal at some point. The strength at his point is called the yield limit and occurs somewhere between 10f and 10 cycles Shafts usually dont need to be surface hardened unless they serve as the actual journal 34. of a bearing surface Since most shaft problems incorporate gears or pulleys that introduce forces in two the shear and bending moment diagrams wil generally be needed in two planes 6 Stress is something that occurs in a part, usually as a result of its being assembled into Young s modulus or the modulus of elasticity is a measure of the strength of a material Resultant moments are obtained by summing moments as absolute values at points of interest along the shaft a machine and loaded fr a stationary load applied on a rotating shaft, a steady bending moment will produce a completely reversed moment as a specific stress element will alternate from compression to tension in every revolution of the shaft oung s modulus or the modulus of elasticity has units of strain of a material Axial stresses on shafts due to the axial components transmied througt moment stress 39. 40. I components transmited through helical ess oeig willalmost always be negligibly smal compared to the bending

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